Here's what I do:
I fill a small bowl with tank water. I crush a clove of garlic into the water, letting it sit about an hour. I strain the garlic out and add the food, letting it sit about a half hour. I feed Formula A, pygmy angel food, spectrum pellets, and flake food. I add the flake food right before I put the mix into the tank. Any small pieces of garlic that go into the tank get eaten, also.
You don't need some overpriced LFS garlic formula. All you need is plain garlic, a garlic press, and a strainer.